New Holland NH 3002 – Engine Controller / Engine ECU: Accelerator Pedal Signal - SOURCE HIGH

The signal voltage coming from the accelerator pedal sensor (or foot throttle sensor) is too high, which typically points to an open circuit or a short to a high voltage source. Because the signal is out of its normal operating range, the Engine Control Unit (ECU) cannot determine the true position of the throttle.

• L218
• L220
• L225
• L230
• C227
• C232

1. 1

   Check the wiring harness between the accelerator pedal sensor and the Engine ECU for an open circuit.

2. 2

   Inspect the wiring for a short circuit to a high voltage source (such as a 5-volt reference wire shorted to the signal wire).

3. 3

   Check the accelerator pedal sensor itself to see if the internal potentiometer has failed and is outputting a signal above the upper tolerance limit.

1. 1

   Locate sensor

   Locate the accelerator pedal sensor (foot throttle sensor) in the cab footwell.

2. 2

   Inspect connector

   Disconnect the sensor and inspect the connector pins for corrosion, damage, or loose connections.

3. 3

   Test wiring

   Use a multimeter to verify the integrity of the wiring harness back to the Engine ECU. Check for continuity and ensure there are no shorts to power or ground.

4. 4

   Repair wiring

   Repair any damaged wiring or connectors found during the inspection.

5. 5

   Replace sensor

   If the wiring harness tests good and the voltage is still reading too high, the fault is internal to the sensor. Replace the accelerator pedal assembly / foot throttle sensor.

6. 6

   Clear codes

   Clear the fault codes from the ECU using a diagnostic tool or DTC eraser to ensure the system returns to normal operation.